Small fix for /src/sbin/mount_union/mount_union.8 man-page

[Matthew Dillon]

:Hello
:
:This fix is taken verbatim from NetBSD, except changing 
:the sysctl name to be correct. The current man-page gives
:misleading information, which is fixed by this patch.
:
:--- mount_union.8.orig  2004-07-17 19:05:52.000000000 +0300
:+++ mount_union.8       2004-07-17 19:09:29.000000000 +0300
:@@ -93,6 +93,10 @@
: To enforce filesystem security, the user mounting the filesystem
:..

    Fixed!

					-Matt
					Matthew Dillon 
					<dillon at xxxxxxxxxxxxx>